Telemetry technology make use of a very small battery to amplify tag ID codes over several hundred meters underwater where they can be detected by fixed or mobile hydrophones.
telemetric emitter (Fotos: IfÖ)
The only externally recognizable transmitters of this type are radio telemetric emitters which have a long antenna which trails either from the mouth, gills, or belly of a tagged fish. Even if the battery is depleted and the code can no longer be read by an antenna, each emitter has a code printed on it which can be referenced to determine when and where the fish was originally tagged.
If you find a telemetric emitter, please fill out the input form and send the transmitter as described on the page “How to send a tag”.
Notable! Send an emitter by mail together with the printed accompanying form.
Send in a telemetric emitter as follow:
- Use adhesive strip to attach the emitter to the corner of an envelope that is opposite the stamp.